I called OSI and they said (actually by voice and then again via email) that it is compatible. I ordered one and found out that it is actually NOT compatible. What you will find is that the temperature is displayed, but then refuses to update after the display is out of the "learn" mode. Needless to say I am disappointed, first that it won't work and secondly that OSI wasn't able to tell me so upfront to save me all the trouble of having to find this out for myself.

Since my last post, I have revisited this project. This time I was successful. What I did was to purchase the THC268 remote themo sensor and a WMR968 display unit. I attached the THC268 sensor to the backside of the spa with a piece of pink insulating foam over it. I wrote a perl script to gather the serial data from the WMR968/sensor and write it to a file. I wrote a cgi script to display the data to a web page. I have a cron job that runs every 30 minutes that will send me an email if the spa temperature is too low.

I have heard lots of people complain about the THWR288 and its apparently poor water intrusion resistance. My solution keeps the temperature sensor dry and doesn't have it contacting the water inside the spa.

I found that like the THWR288 sensor, the THC268 sensor was not compatible with the WMR918 console. Additionally, the WMR968 console does not work with any of the WMR918 sensors. Again, OSI didn't seem to know what was compatible with what.

Since my last post, I have revisited this project. This time I was successful. What I did was to purchase the THC268 remote themo sensor and a WMR968 display unit. I attached the THC268 sensor to the backside of the spa with a piece of pink insulating foam over it. I wrote a perl script to gather the serial data from the WMR968/sensor and write it to a file. I wrote a cgi script to display the data to a web page. I have a cron job that runs every 30 minutes that will send me an email if the spa temperature is too low.

I have heard lots of people complain about the THWR288 and its apparently poor water intrusion resistance. My solution keeps the temperature sensor dry and doesn't have it contacting the water inside the spa.

I found that like the THWR288 sensor, the THC268 sensor was not compatible with the WMR918 console. Additionally, the WMR968 console does not work with any of the WMR918 sensors. Again, OSI didn't seem to know what was compatible with what.

Sounds cool, would you mind posting the perl script you wrote? I would like to try out making a simple web page from the data I could get from a flat file. Getting the info from the serial port is not my strong point.

I have the same light, "See Indoor Control Panel if flashing," flashing. I have had issue with the temp. sensors and just replaced the air temp sensor as it was not measuring properly. The air temp is now reading accurately but the light continues to flash. Any thoughts?